CN114606639A - Adhesive, inorganic fiber product and method for preparing inorganic fiber product - Google Patents

Adhesive, inorganic fiber product and method for preparing inorganic fiber product Download PDF

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Publication number
CN114606639A
CN114606639A CN202210351103.7A CN202210351103A CN114606639A CN 114606639 A CN114606639 A CN 114606639A CN 202210351103 A CN202210351103 A CN 202210351103A CN 114606639 A CN114606639 A CN 114606639A
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Prior art keywords
inorganic fiber
adhesive
fiber product
product
binder
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Inventor
曾影
郭思含
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Chongqing Fiber Research And Design Institute Co ltd
Chongqing Zaisheng Technology Corp ltd
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Chongqing Fiber Research And Design Institute Co ltd
Chongqing Zaisheng Technology Corp ltd
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Priority to CN202210351103.7A priority Critical patent/CN114606639A/en
Publication of CN114606639A publication Critical patent/CN114606639A/en
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4209—Inorganic fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/587—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives characterised by the bonding agents used

Abstract

The invention provides an adhesive, an inorganic fiber product and a method for preparing the inorganic fiber product. The adhesive comprises: at least one reducing sugar; and at least one nitrogen-containing compound; and a thickener. The inorganic fiber product is obtained by thermosetting bonding of a bonding agent. The method of making the inorganic fiber product comprises dispersing inorganic fibers in water to form a homogeneous dispersion; filtering the dispersion to obtain an inorganic fiber preform having a predetermined thickness and moisture; spraying the adhesive onto the inorganic fiber prefabricated product, and curing and forming at 120-260 ℃ to obtain the inorganic fiber product. The adhesive solves the problems of viscosity and surface tension of the traditional saccharide formaldehyde-free adhesive, can ensure that the adhesive in inorganic fiber products is dispersed more uniformly, enhances the sizing uniformity of the adhesive in the inorganic fiber products, and has more excellent tensile strength performance of the inorganic fiber products.

Description

Adhesive, inorganic fiber product and method for preparing inorganic fiber product
Technical Field
The present invention relates to the field of inorganic fibers, and more particularly, to an adhesive, an inorganic fiber product, and a method of making an inorganic fiber product.
Background
Inorganic fiber products such as inorganic fiber mats have excellent heat insulating and sound insulating properties and are often used as building materials such as floors, sidings, partitions, roof boards, and the like. Inorganic fiber mats generally have two forms, the softer often referred to as felt; the formed board with certain stiffness can realize the conversion of application performance only by the joint action of the binder and the inorganic fiber in different forms.
The conventional inorganic fiber mat for buildings contains urea-formaldehyde resin, phenolic resin and melamine glue, and the main manufacturing raw materials of the inorganic fiber mat for buildings are phenol, melamine, formaldehyde and the like. Such adhesives emit harmful Volatile Organic Compounds (VOCs), such as formaldehyde, during and even after manufacture, and thus do not meet the environmental and safety requirements of the building industry. To this end, attempts have been made to develop formaldehyde-free binders for sugars, for example patent publication No. CN101668713A discloses a high density mineral fibre board with a formaldehyde-free binder based on the polymerization of reducing sugars with amine compounds. Typically, such binders are applied to the fibrous mat in the form of an aqueous solution, which is then dried and cured. However, these carbohydrate binders are often diluted in large amounts of aqueous solution, usually with a solids content of less than 20% after dilution, and therefore have a low viscosity, usually less than 3X 10-3Pa.s, which easily migrate to the bottom of the fiber mat during application, cause uneven binder coverage in the fiber mat, and ultimately product performance drift. If the viscosity is increased by reducing the amount of water and increasing the solid content, the migration performance of the binder is reduced, so that too much binder is arranged at the top of the inorganic fiber mat, and less binder is arranged at the bottom of the inorganic fiber mat, which also affects the performance deviation of the final product. Furthermore, the surface tension of the aqueous solution also affects the spreading properties of the adhesive on the surface of the material, which is also an important property of the adhesive that is not negligible.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art as set forth above. For example, one of the objects of the present invention is to solve the problem of non-uniform sizing due to the viscosity of conventional sugar-based formaldehyde-free binders, and to provide a binder capable of being uniformly dispersed during the sizing process.
An aspect of the present invention provides a binder, which may include at least one reducing sugar; and at least one nitrogen-containing compound; and a thickener.
In one exemplary embodiment of the binder of the present invention, the reducing sugar comprises at least one aldehyde group.
In an exemplary embodiment of the adhesive of the present invention, the reducing sugar may be selected from one or more of glucose, dextrose, fructose, aldose, galactose, allose, xylose, ribose, maltose, cellobiose, and lactose.
In one exemplary embodiment of the adhesive of the present invention, the nitrogen-containing compound may be selected from R3-CO-NR1R2、NH2-CR1R2-COOH、NR1R2-CO-NR3R4And ammonium salt, wherein R1、R2、R3、R4May be selected from at least one of H, alkyl groups, aryl groups, alcohol groups, aldehyde groups, ketone groups, carboxylic acid groups, and alkoxy groups.
In one exemplary embodiment of the adhesive of the present invention, the thickener may be selected from one or more of hydroxyethyl cellulose, carboxymethyl cellulose, xanthan gum and guar gum.
In an exemplary embodiment of the adhesive of the present invention, the thickener may be contained in an amount of not more than 3.0% by mass of the adhesive.
In one exemplary embodiment of the adhesive of the present invention, the weight average molecular weight of the thickener may be 100000g/mol to 2000000 g/mol.
In an exemplary embodiment of the adhesive of the present invention, the adhesive may have a pH of 5.5 to 8.
In one exemplary embodiment of the adhesive of the present invention, the adhesive may have a dynamic viscosity of 7 to 50mpa.s at 20 ℃ and a surface tension of 35 to 50 mN/m.
In an exemplary embodiment of the adhesive of the present invention, the adhesive may further comprise a catalyst, wherein the catalyst comprises at least one anion or cation.
In one exemplary embodiment of the adhesive of the present invention, the anion may be selected from one or more of sulfate, sulfite, nitrate, nitrite, phosphate, halide, and oxyhalide ions; the cation may be selected from one or more of aluminium, zinc, iron, copper, magnesium, tin, zirconium and titanium.
Another aspect of the present invention provides an inorganic fiber product which can be bonded by thermosetting with the above-mentioned binder.
In an exemplary embodiment of the inorganic fiber product of the present invention, the inorganic fiber product may contain a binder in an amount of 1.5 to 30% by mass of the inorganic fiber product.
In one exemplary embodiment of the inorganic fiber product of the present invention, the inorganic fiber product may contain organic fibers in an amount of not more than 25% by mass of the inorganic fiber product.
In one exemplary embodiment of the inorganic fiber product of the present invention, the density of the inorganic fiber product may be 12kg/m3～120kg/m3The fiber diameter may be 2 μm to 25 μm.
Yet another aspect of the present invention provides a method for preparing inorganic fibers, which may include the steps of: dispersing inorganic fibers in water to form a uniform dispersion; filtering the dispersion to obtain an inorganic fiber preform having a predetermined thickness and moisture; spraying the adhesive onto the inorganic fiber prefabricated product, and curing and molding at 120-260 ℃ to obtain the inorganic fiber product.
Yet another aspect of the present invention provides a method for preparing inorganic fibers, which may include the steps of: carrying out pyrogenic blowing to obtain an inorganic fiber prefabricated product; spraying the adhesive onto the inorganic fiber prefabricated product, and curing and molding at 120-260 ℃ to obtain the inorganic fiber product.
Compared with the prior art, the invention has the beneficial effects that at least: the adhesive can be uniformly dispersed in an inorganic fiber product, so that the distribution amount of the adhesive at the top and the bottom of the inorganic fiber is equal, the sizing uniformity of the adhesive in the inorganic fiber product is enhanced, the tensile strength performance of the inorganic fiber product is improved, and the problems of uneven sizing at the top and the bottom of the inorganic fiber product in the sizing process and poor spreading performance of the adhesive on the surface of an inorganic fiber material due to inappropriate surface tension of the traditional saccharide formaldehyde-free adhesive caused by inappropriate viscosity are solved.
Detailed Description
Hereinafter, an adhesive, an inorganic fiber product, and a method of manufacturing an inorganic fiber product according to the present invention will be described in detail with reference to exemplary embodiments.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. Unless the context has a significantly different meaning, the singular forms of expressions include the plural forms of expressions. As used herein, it is understood that terms such as "comprising," "having," "including," and the like are intended to refer to the presence of features, numbers, operations, components, parts, elements, materials, or combinations thereof. The terms of the present invention are disclosed in the specification and are not intended to exclude the possibility that one or more other features, numbers, operations, components, parts, elements, materials or combinations thereof may be present or may be added. As used herein, "/" can be interpreted as "and" or "depending on the circumstances.
Specifically, the inventor finds that when the viscosity of the adhesive is too low after the conventional adhesive is applied to the inorganic fibers in the process of sizing (spraying the adhesive), part of the adhesive is migrated to the bottom of the inorganic fibers during top sizing of the inorganic fibers, which seriously affects the coverage uniformity of the adhesive and causes the performance deviation of the inorganic fiber product. Further, if the viscosity of the binder is too high, the binder on the top of the inorganic fiber mat becomes too much, the binder on the bottom becomes too little, the binder inside the inorganic fiber product becomes unevenly distributed, and the performance of the inorganic fiber product is also deviated. Further, if the surface tension of the binder is not good, the spreading property of the binder on the surface of the inorganic fiber product is also affected, and the performance of the inorganic fiber product is also affected. Based on the technical problems, the invention provides an adhesive with proper viscosity and surface tension to overcome the defects of the conventional adhesive.
One aspect of the present invention provides an adhesive. In one exemplary embodiment of the binder of the present invention, the binder may comprise at least one reducing sugar; and at least one nitrogen-containing compound; and a thickener. The adhesive is a formaldehyde-free adhesive and is environmentally friendly since it does not emit harmful volatile organic compounds such as formaldehyde. In addition, compared with the traditional sugar-type bonding, the bonding agent has the advantages that through the addition of the thickening agent and the interaction of the reducing sugar and the nitrogen-containing compound, the bonding agent has proper dynamic viscosity (the dynamic viscosity at 20 ℃ is 7-50 mPa.s) and surface tension (35-50 mN/m) in the using process, the bonding agent in the inorganic fiber product can be uniformly dispersed, and the inorganic fiber product can be uniformly covered in the applying process; the inorganic fiber product has proper surface tension, can be uniformly spread on the surface of the inorganic fiber, is uniformly sized, and has more excellent tensile strength. The adhesive of the present invention can be used for bonding in various fields, and is particularly suitable for bonding inorganic fibers.
Further, the reducing sugar may be a reducing sugar having at least one aldehyde group. In the case of nitrogen-containing compounds containing amine groups, reducing sugars containing aldehyde groups can undergo condensation reactions with the free amine groups of the nitrogen-containing compound during thermosetting in the preparation of the binder, which is also the first step in the maillard reaction for the preparation of the binder.
Further, the reducing sugar may be one or more of glucose, dextrose, fructose, aldose, galactose, allose, xylose, ribose, maltose, cellobiose, and lactose. Of course, the reducing sugar of the present invention is not limited thereto, and the reducing sugar may contain an aldehyde group without departing from the object of the present disclosure.
Further, the nitrogen-containing compound may be selected from R3-CO-NR1R2、NH2-CR1R2-COOH、NR1R2-CO-NR3R4And ammonium salt, wherein R1、R2、R3、R4At least one selected from the group consisting of H, alkyl groups, aryl groups, alcohol groups, aldehyde groups, ketone groups, carboxylic acid groups, and alkoxy groups. The nitrogen-containing compound can be well polymerized with saccharides, and the reaction is simpleAnd the speed is high. For example, amides and saccharides are susceptible to oligomerization, form stronger, harder cured binder products, and are more reactive to form polyimides. Polymerization reactions such as urea derivatives with saccharides in the presence of a catalyst react rapidly, and the resulting cured binder product remains neutral and less corrosive to the environment of use. The content ratio of the reducing sugar to the nitrogen-containing compound can be adjusted adaptively according to the types of the reducing sugar and the nitrogen-containing compound, for example, the mass ratio of the reducing sugar to the nitrogen-containing compound can be 1 (1-99), or (21-68): 1, or 78: 1.
Further, the thickener may be selected from one or more of hydroxyethylcellulose, carboxymethylcellulose, xanthan gum and guar gum.
Further, the thickener content may be not more than 3.0% by mass of the binder. Setting the thickener content to 3.0 mass% or less ensures that the adhesive has an appropriate viscosity. When the content of the thickener is more than 3.0 wt%, the migration performance of the adhesive is too low, so that the top adhesive of the inorganic fiber product is too much, the bottom adhesive of the inorganic fiber product is less, and finally the performance of the inorganic fiber product is deviated. For example, the content of the thickener may be 0.5%, 0.8%, 1.2%, 1.8%, 2.2%, 2.5%, or the like based on the mass of the adhesive. For another example, the viscosity of the composition can be increased to 7 to 50mPa.s (20 ℃) by adding 0.05 to 0.3% by weight of hydroxyethyl cellulose. For another example, the viscosity of the composition can be increased to 15 to 50mpa.s (20 ℃) by adding 0.03 to 0.2% by weight of xanthan gum. Specifically, the addition of 0.21% by weight of hydroxyethyl cellulose increased the viscosity of the composition to 45mPa.s (20 ℃). As another example, the addition of 1.2% by weight xanthan gum can increase the viscosity of the composition to 38mpa.s (20 ℃).
Above, the kind and content of the thickener have a great influence on the viscosity and surface tension of the adhesive. On the one hand, the thickener used in the invention does not participate in the Maillard reaction to influence the performance of the adhesive, and on the other hand does not influence the performance of the fiber product, such as formaldehyde and other unfriendly substances. Therefore, the present invention selects the kind and content of the above thickener.
Further, the weight average molecular weight of the thickener may be 100000g/mol to 2000000 g/mol. At the thickener weight average molecular weight in the above range, a change in viscosity of the adhesive can be achieved. If the weight average molecular weight of the thickener is more than 2000000g/mol, it will be difficult to dissolve in water. For example, the thickener may have a weight average molecular weight of 120000g/mol, 135000g/mol, 150000g/mol, 550000g/mol, 760000g/mol, 870000g/mol, 1020000g/mol, 1250000g/mol, 1680000g/mol, 1720000g/mol, 184000g/mol or 172000 g/mol.
Further, the pH of the adhesive can be 5.5-8. For example, the pH of the adhesive may be 6.2; for another example, the pH of the adhesive may be 7.3.
Further, the dynamic viscosity of the adhesive at 20 ℃ may be 7 to 50mPa.s, for example, the dynamic viscosity at 20 ℃ may be 21 mPa.s. For another example, the dynamic viscosity at 20 ℃ may be 37 mPa.s.
Further, the surface tension of the adhesive may be 35mN/m to 50 mN/m. For example, the surface tension of the adhesive may be 38 mN/m. For another example, the surface tension of the adhesive may be 42 mN/m.
The adhesive with the dynamic viscosity of 7-50 mPa.s and the surface tension of 35-50 mN/m has the advantages that on one hand, the adhesive cannot excessively migrate to the bottom of a fiber product due to too low viscosity in the application process of the adhesive to cause uneven coverage of the adhesive and cause low performance of the product; on the other hand, the viscosity is not so high that the inorganic fiber mat is piled up on the top. The viscosity of the adhesive is proper, so that the adhesive has proper migration performance, and the adhesive can be uniformly dispersed.
Further, the binder may further contain a catalyst. The catalyst may comprise at least one anion and cation. Wherein the anion can be one or more of sulfate, sulfite, nitrate, nitrite, phosphate, halide and oxyhalide. The cation may be one or more of aluminum, zinc, iron, copper, magnesium, tin, zirconium, and titanium.
Further, in order to further increase the performance of the adhesive and the inorganic fiber product, to optimize the curing process of the adhesive, the adhesive may further comprise one or more of the following additives, for example, surfactants, oxygen scavengers, solvents, emulsifiers, pigments, organic and/or inorganic fillers, flame retardants, anti-migration aids, coalescing aids, curing catalysts, wetting agents, bactericides, plasticizers, organosilanes, anti-foaming agents, colorants, suspending agents and/or antioxidants, and the like. The above additives may be added in an amount according to the actual application environment or experience.
Another aspect of the invention provides an inorganic fiber article. In an exemplary embodiment of the inorganic fiber product of the present invention, the inorganic fiber product may be an inorganic fiber mat, and the inorganic fiber product may be obtained by thermosetting bonding the above-mentioned binder. Here, the thermosetting adhesive may be obtained by mixing an adhesive with inorganic fibers and then curing the mixture at a predetermined curing temperature. For example, the predetermined curing temperature may be 120 ℃ to 260 ℃.
Further, the binder in the inorganic fiber product may be 1.5% to 30% by mass of the inorganic fiber product. Under the content of the adhesive, the tensile strength performance of the inorganic fiber product is more excellent and can reach more than 9.0N/25 mm. Preferably, the binder in the inorganic fiber product can be 10-20% of the inorganic fiber product by mass, and in this case, the tensile strength of the inorganic fiber product can be more than 9.2N/25 mm.
Further, the inorganic fiber product may further comprise at least one Maillard polymerization product. The Maillard polymerization reaction product refers to that reducing sugar and amino compound in the adhesive generate a solidified polymer through polymerization reaction, so that the adhesive has the function of adhesion.
Further, the inorganic fiber product may contain an organic fiber. The organic fiber is not more than 25% of the inorganic fiber product by mass, for example, the organic fiber accounts for 18% of the inorganic fiber product by mass or 12% of the inorganic fiber product by mass. The organic fiber may be nylon, polyester, polyethylene, etc.
Further, the density of the inorganic fiber product may be 12kg/m3～120kg/m3For example, the density of the inorganic fiber product may be 32kg/m3、58kg/m3、79kg/m3Or 101kg/m3. The fiber diameter of the inorganic fiber product may be 2 to 25 μm. For example, the fiber diameter of the inorganic fiber product may be 8 μm, 12 μm, 17 μm, or 23 μm.
In yet another aspect of the invention, a method of making an inorganic fiber article is provided. In one exemplary embodiment of the method of making an inorganic fiber article of the present invention, the following steps may be included:
and S01, dispersing the inorganic fibers in water to form a uniform dispersion.
S02, filtering the dispersion to obtain an inorganic fiber preform having a predetermined thickness and moisture. The dispersion may be filtered by passing the dispersion through a forming wire and filtering the excess water by vacuum suction. The predetermined thickness and moisture may be set according to an actual inorganic fiber product application environment.
S03, spraying the adhesive on the inorganic fiber prefabricated product, and curing and forming at 120-260 ℃ to obtain the inorganic fiber product. Here, after the binder is sprayed onto the inorganic fiber preform, the binder may be cured by removing water through a high temperature furnace. The inorganic fiber product can be subjected to a certain pressure in a high-temperature furnace, so that the inorganic fiber reaches the preset target thickness, and the purpose of shaping is realized.
In yet another aspect of the invention, a method of making an inorganic fiber article is provided. In one exemplary embodiment of the method of making an inorganic fiber article of the present invention, the following steps may be included:
and S100, carrying out pyrogenic blowing to obtain an inorganic fiber preform.
S200, spraying the adhesive on the inorganic fiber prefabricated product, and curing and molding at 120-260 ℃ to obtain the inorganic fiber product.
Specifically, the inorganic fiber prefabricated product is prepared by a flame blowing method and then is laid on a moving forming net; applying a binder to the inorganic fiber preform in a spray pattern; removing water in a high-temperature furnace to realize the solidification of the binder, wherein the solidification temperature is 120-260 ℃. The inorganic fiber mat can be given a certain pressure in a high temperature furnace, so that the inorganic fiber mat reaches the target thickness and the shaping purpose is realized.
For a better understanding of the present invention, the following further illustrates the contents of the present invention with reference to specific examples, but the contents of the present invention are not limited to the following examples.
The adhesives listed in table 1 were prepared by: each formulation was mixed in water to give an adhesive with a solids content of 18%.
TABLE 1 adhesive composition
Figure BDA0003580339880000071
Figure BDA0003580339880000081
The contents in table 1 are all mass percents. The kinematic viscosity was tested by GB/T10247 and 2008 viscosity measurement method. The surface tension was tested using GB/T22237-2008 surfactant-surface tension assay. The breaking strength was measured by means of the FED-STD-191 method 5100, and the test specimen size was 76mm × 152 mm.
TABLE 2 Adhesives Properties
Viscosity mPa.s Surface tension mN/m PH
Example 1 13.78 37 6.5
Example 2 16.05 36 6.6
Example 3 12.13 39 6.8
Example 4 36.74 34 6.8
Example 5 39.27 33 6.6
Example 6 49.58 35 6.7
Comparative example 1 2.54 44 6.6
Comparative example 2 2.62 47 6.7
Comparative example 3 2.59 46 6.6
From the experimental data in tables 1 and 2, the viscosity of the adhesive is remarkably improved after the thickening agent is added, the viscosity can reach more than 12mPa.s under the premise that the solid content of the adhesive is less than 20, and excessive migration to the bottom of a fiber mat can be avoided in the application process, so that the adhesive is not uniformly covered, and the product performance is influenced. From the surface tension, the surface tension is reduced after the thickening agent is added, the spreading performance of the adhesive on the surface of the material is improved, and the viscosity and the spreading performance are combined.
The inorganic fiber mats listed in table 3 were prepared by: dispersing the adhesives in the table 1 in water to form uniform dispersions; passing the dispersion through a forming screen, and filtering excess water by means of vacuum suction to form an inorganic fiber mat; spraying the adhesive on the inorganic fiber mat for gluing treatment, and curing and forming in a high-temperature furnace at 150 ℃ to obtain the final inorganic fiber mat product. Wherein the gram weight of the inorganic fiber mat before sizing is 230g/m2The average fiber diameter was 2.5. mu.m. The density of each inorganic fiber mat product obtained finally is 24kg/m3The thicknesses were all 12mm, and the final inorganic fiber mat product properties were as described in table 3 below.
TABLE 3 inorganic fiber Mat Properties
Figure BDA0003580339880000091
As can be seen from Table 3, in the case of comparative examples 1 to 3, the difference between the upper layer ignition loss and the lower layer ignition loss of the obtained inorganic fiber mat is obvious under the condition that no thickening agent is added, which shows that the excessive migration of the adhesive to the bottom of the fiber mat due to too low viscosity of the adhesive causes uneven coverage of the adhesive in the fiber mat; the burning loss of the upper layer of the inorganic fiber mat is equivalent to that of the lower layer of the inorganic fiber mat after the adhesive of the specific amount of the thickening agent is applied in the examples 1 to 6, which shows that the adhesive of the above composition has proper viscosity and avoids excessive migration to the bottom of the fiber mat due to too low viscosity; and the excessive top binder and the less bottom binder of the fiber mat caused by too high viscosity are avoided, the tensile strength of the obtained inorganic fiber mat is more excellent, and the performance deviation affecting the final product is avoided.
Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. An adhesive, comprising:
at least one reducing sugar; and
at least one nitrogen-containing compound; and
a thickening agent.
2. The adhesive according to claim 1, wherein the content of the thickener is not more than 3.0% by mass of the adhesive, and the weight average molecular weight of the thickener is 100000g/mol to 2000000 g/mol.
3. A binder as claimed in claim 1 or 2, wherein the reducing sugar is selected from one or more of glucose, dextrose, fructose, aldose, galactose, allose, xylose, ribose, maltose, cellobiose and lactose; the nitrogen-containing compound is selected from R3-CO-NR1R2、NH2-CR1R2-COOH、NR1R2-CO-NR3R4And ammonium salt, wherein, R1、R2、R3、R4At least one selected from the group consisting of H, alkyl groups, aryl groups, alcohol groups, aldehyde groups, ketone groups, carboxylic acid groups, and alkoxy groups; thickening agentSelected from one or more of hydroxyethyl cellulose, carboxymethyl cellulose, xanthan gum and guar gum.
4. A binder as claimed in claim 1 or claim 2, wherein the reducing sugar contains at least one aldehyde group.
5. The adhesive according to claim 1 or 2, wherein the pH of the adhesive is 5.5 to 8, the dynamic viscosity of the adhesive at 20 ℃ is 7 to 50mPa.s, and the surface tension is 35 to 50 mN/m.
6. A binder as claimed in claim 1 or claim 2 further comprising a catalyst, wherein the catalyst comprises at least one anion or cation, the anion being selected from one or more of sulphate, sulphite, nitrate, nitrite, phosphate, halide and oxyhalide ions; the cation is selected from one or more of aluminum, zinc, iron, copper, magnesium, tin, zirconium and titanium.
7. An inorganic fiber product characterized in that it is bonded thermosetting by the binder according to any one of claims 1 to 11.
8. The inorganic fiber product of claim 7, wherein the binder is 1.5-30% of the inorganic fiber product by mass; the inorganic fiber product contains no more than 25% of organic fiber by mass of the inorganic fiber product.
9. The mineral-fiber product of claim 7 or 8, characterized in that the mineral-fiber product has a density of 12kg/m3~120kg/m3The diameter of the fiber is 2 μm to 25 μm.
10. A method of making the inorganic fiber product of any of claims 7 to 9, comprising the steps of:
dispersing inorganic fibers in water to form a uniform dispersion, and filtering to obtain an inorganic fiber preform with a predetermined thickness and moisture; or carrying out pyrogenic blowing to obtain an inorganic fiber preform;
spraying the adhesive onto the inorganic fiber prefabricated product, and curing and forming at 120-260 ℃ to obtain the inorganic fiber product.
CN202210351103.7A 2022-04-02 2022-04-02 Adhesive, inorganic fiber product and method for preparing inorganic fiber product Pending CN114606639A (en)

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